Two-Photon Polarization Spectroscopy in CuCl

Kuwata, Makoto

doi:10.1143/jpsj.53.4456

Cited by 39 publications

(5 citation statements)

References 18 publications

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“…Kuwata [1] reported the two signals corresponding to the two branches in the two-photon polarization spectroscopy. However, we observed the induced absorption only at one pump beam energy for each probe beam, and the absorption is assigned to arise from the upper branch by the energies of pump and probe beams.…”

Section: Results For Upper Branch Regionmentioning

confidence: 99%

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Effect of Polariton-Polariton Scattering on the Two-Photon Transition to Biexcitons in CuCl

Ichimiya

Watanabe

Hayashi

2001

phys. stat. sol. (b)

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Two-photon absorption spectra of the biexciton transition in CuCl have been investigated using a pump-probe technique. Combinations of two circularly-polarized lightbeams with various photon energies are used to examine the relation of the absorption to the transition selection rule. The absorption is found to occur even for the forbidden configuration of polarizations of two beams when the photon energy of the one incident light is close to the exciton resonance. The departure from the selection rule is shown to arise from depolarization of polaritons. The degree of depolarization depends on the polariton density. It is concluded that the elastic scattering between polaritons is the dominant process mediating the two-photon transition under forbidden configuration.

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Section: Results For Upper Branch Regionmentioning

confidence: 99%

“…biexcitons. It is also possible that the biexciton is directly created via a two-photon resonant transition, in which the sum of two photon energies corresponds to the biexciton energy [1,2]. A polarization selection rule exists for the two-photon transition [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Polariton-Polariton Scattering on the Two-Photon Transition to Biexcitons in CuCl

Ichimiya

Watanabe

Hayashi

2001

phys. stat. sol. (b)

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“…More specifically, we show how the transparency of a probe beam within the Z 3 -exciton polariton stop-band can be controlled via a pump light beam resonant with the transition from the Z 3 -exciton to the G 1 -biexciton. The large oscillator strength of the excitonbiexciton transition and the very narrow linewidth and long coherence time of the biexciton state in the small wave-vector region [6,7] appear to favor quite appreciable degrees of transparency. The phenomenon is reminiscent of EIT effects occurring in three-level atomic systems [1,8], except that in CuCl delocalized electronic excitations in a crystalline structure are involved instead [9].…”

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confidence: 99%

Exciton–biexciton quantum coherence and polaritonic stop‐band transparency in CuCl

Chesi

Artoni

Rocca

et al. 2004

phys. stat. sol. (c)

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A coherently driven exciton-biexciton transition in CuCl enables one to propagate a probe light beam within the exciton-polariton stop-band where radiation is otherwise completely reflected. The stop-band transparency window can be controlled via the pump beam frequency and intensity. The phenomenon is reminiscent of quantum coherence effects occurring in three-level atomic systems, except that it here involves delocalized electronic excitations in a crystal via a frequency and wave-vector selective polaritonic mechanism. Both a free standing slab and a microcavity configuration are theoretically studied.Phenomena based on three-level quantum coherence in atomic physics have been of considerable importance in recent years. Ranging from rather familiar effects, such as electromagnetically induced transparency (EIT) and lasing without inversion (LVI), to currently developing applications of ultraslow light, these phenomena all depend on the existence of quantum-coherence in a multi-level system [1,2]. We here report on effects of quantum coherence between exciton and biexciton [3] levels in CuCl. CuCl is a prototype example of a semiconductor having an allowed interband transition, quite pronounced exciton and biexciton resonances [4] and exhibiting, in particular, a fully developed polaritonic stop-band. We predict that a pump driven exciton-biexciton transition allows for a well developed transparency within the stop-band where a probe pulse may propagate, although with a strongly reduced group velocity [5]. More specifically, we show how the transparency of a probe beam within the Z 3 -exciton polariton stop-band can be controlled via a pump light beam resonant with the transition from the Z 3 -exciton to the G 1 -biexciton. The large oscillator strength of the excitonbiexciton transition and the very narrow linewidth and long coherence time of the biexciton state in the small wave-vector region [6,7] appear to favor quite appreciable degrees of transparency. The phenomenon is reminiscent of EIT effects occurring in three-level atomic systems [1,8], except that in CuCl delocalized electronic excitations in a crystalline structure are involved instead [9]. Unlike in atomic-like media, the physics of the induced transparency within an otherwise reflecting stop-band relies on a frequency and wave-vector selective polaritonic mechanism.Transparency can be induced in our case through a ladder scheme in which a circularly polarized probe beam is nearly resonant with the transition from the crystal ground state to the Z 3 exciton with dispersion w x ðkÞ ¼ w T þ hk 2 =ð2m x Þ, while a pump beam having opposite circular polarization couples

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“…16 The homogeneous broadening ប͑␥ 0 ϩ␥͒ depends also on the incident frequency ranging from 0.05 to 2.0 meV in good crystal and it becomes 3.0 meV in a poor crystal of CuCl, 22 while ប␥ 0 ϳ0.03 meV is estimated from the lifetime of a single exciton. 23 The diffusion constant D depends on the quality of the crystal and also on frequency, ranging from 0.1 to 10 5 cm 2 /sec. For the case of excitons in a good crystal of Cu 2 O, the diffusion constant D was estimated to be 600 cm 2 /sec.…”

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confidence: 99%

Phase-conjugated signal induced and enhanced by weak localization of excitonic polaritons

Hanamura¹

1996

Phys. Rev. B

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A phase-conjugated signal is shown theoretically to be induced and enhanced by weak localization of excitonic polaritons in a crystal containing a high density of elastic scatterers under irradiation of a single pump and test beams which are nearly two-photon resonant to a biexciton. This signal is nonexistent without this weak localization so that its observation gives us its direct evidence. Several characteristics peculiar to the weak localization are listed to confirm it.

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Two-Photon Polarization Spectroscopy in CuCl

Cited by 39 publications

References 18 publications

Effect of Polariton-Polariton Scattering on the Two-Photon Transition to Biexcitons in CuCl

Effect of Polariton-Polariton Scattering on the Two-Photon Transition to Biexcitons in CuCl

Exciton–biexciton quantum coherence and polaritonic stop‐band transparency in CuCl

Phase-conjugated signal induced and enhanced by weak localization of excitonic polaritons

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